Moderate grazing by cattle increases the heterogeneity of soil and vegetation. This has been suggested as an ecologically sustainable mean of managing natural environments endangered by tree encroachment, such as heat...Moderate grazing by cattle increases the heterogeneity of soil and vegetation. This has been suggested as an ecologically sustainable mean of managing natural environments endangered by tree encroachment, such as heathlands. Our study was performed to test the impact of grazing intensity on soil macroinvertebrate communities in heterogeneous landscapes in a private property eligible to the Natura 2000 European Network of Special Protection Areas within the Brenne Natural Regional Park(Indre, France). We sampled macroinvertebrates along a broken line crossing 5 different land-use types, from pasture to pine forest, passing through a besom heath(Erica scoparia) heathland at 3 levels of cattle pressure. We hypothesized that: i) litter-dwelling(mostly arthropods and mollusks)and soil-dwelling macroinvertebrates(mostly earthworms) would respond in an opposite manner to various grazing intensities, and ii) intermediate cattle pressure(pastured heath) would increase soil and community heterogeneity. The results supported the first hypothesis, which was explained by land-use impacts mediated by soil properties. However, our results supported only partly the second hypothesis since maximum dissimilarity(whether in the composition of soil macroinvertebrate communities or in soil features)was observed in only one out of the two pastured heaths where cattle pressure was intermediate.展开更多
Geogenic lead (Pb) is considered to be less bioavailable than anthropogenic Pb and exerts less effect on the soil fauna. However,Pb contamination in vegetables has been reported in the case of geogenic anomalies, even...Geogenic lead (Pb) is considered to be less bioavailable than anthropogenic Pb and exerts less effect on the soil fauna. However,Pb contamination in vegetables has been reported in the case of geogenic anomalies, even at moderate concentrations (around 170 mgkg^(-1)). In this study, we investigated collembolan communities using both taxonomic- and trait-based approaches and observed fungal communities to assess the effects of a moderate geogenic Pb anomaly on collembolans and fungi in an urban vegetable garden soil.Results indicated that geogenic Pb indeed modified fungi communities and altered the functional structure of collembolan communities in garden soils. Although geogenic Pb presented low bioavailability, it affected soil fauna and vegetables similar to anthropogenic Pb.展开更多
基金supported by the Institut Fédératif de Recherches, France (No.101)
文摘Moderate grazing by cattle increases the heterogeneity of soil and vegetation. This has been suggested as an ecologically sustainable mean of managing natural environments endangered by tree encroachment, such as heathlands. Our study was performed to test the impact of grazing intensity on soil macroinvertebrate communities in heterogeneous landscapes in a private property eligible to the Natura 2000 European Network of Special Protection Areas within the Brenne Natural Regional Park(Indre, France). We sampled macroinvertebrates along a broken line crossing 5 different land-use types, from pasture to pine forest, passing through a besom heath(Erica scoparia) heathland at 3 levels of cattle pressure. We hypothesized that: i) litter-dwelling(mostly arthropods and mollusks)and soil-dwelling macroinvertebrates(mostly earthworms) would respond in an opposite manner to various grazing intensities, and ii) intermediate cattle pressure(pastured heath) would increase soil and community heterogeneity. The results supported the first hypothesis, which was explained by land-use impacts mediated by soil properties. However, our results supported only partly the second hypothesis since maximum dissimilarity(whether in the composition of soil macroinvertebrate communities or in soil features)was observed in only one out of the two pastured heaths where cattle pressure was intermediate.
基金supported by the ANR (French National Agency of Research, JASSUR research project ANR-12-VBDU-0011)
文摘Geogenic lead (Pb) is considered to be less bioavailable than anthropogenic Pb and exerts less effect on the soil fauna. However,Pb contamination in vegetables has been reported in the case of geogenic anomalies, even at moderate concentrations (around 170 mgkg^(-1)). In this study, we investigated collembolan communities using both taxonomic- and trait-based approaches and observed fungal communities to assess the effects of a moderate geogenic Pb anomaly on collembolans and fungi in an urban vegetable garden soil.Results indicated that geogenic Pb indeed modified fungi communities and altered the functional structure of collembolan communities in garden soils. Although geogenic Pb presented low bioavailability, it affected soil fauna and vegetables similar to anthropogenic Pb.
